Someone claims a wallet can start with 2 on btc mainnet. How possible is dat. I knw 2 is the testnet pay 2 script wallet type. If its possible. How can it be generated?attached is an example of the wallet in question
Addresses starting with the character "2" are Pay to Script Hash addresses on Testnet. They are not valid addresses on Mainnet.
You can find a list of all Base58Check encoded address prefixes used in Bitcoin on the wiki.